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arXiv 1706.07052hep-phastro-ph.COnucl-th
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碰撞对稠密中微子气体中中微子味不均匀性的影响

Effect of collisions on neutrino flavor inhomogeneity in a dense neutrino gas

Vincenzo Cirigliano, Mark W. Paris, Shashank Shalgar

摘要:

本文研究了二维稠密中微子气体在空间不均匀性下的稳定性。由于非线性相干中微子自相互作用,该系统表现出种子不均匀性的增长。在不存在非相干碰撞效应的情况下,我们观察到这种不稳定性增长率对中微子质谱的依赖性:正常中微子质量等级在中微子数密度的较大范围内表现出空间不稳定性。我们进一步考虑的弹性非相干碰撞的中微子与静态背景的重,类核子散射的效果。在小尺度上,味道不稳定性的增长可以通过碰撞来抑制。在大的长度尺度上,我们发现,也许令人惊讶的是,倒置的中微子质量层次的非相干碰撞无法抑制味不稳定性,独立的耦合强度。

英文摘要:

We investigate the stability, with respect to spatial inhomogeneity, of a two-dimensional dense neutrino gas. The system exhibits growth of seed inhomogeneity due to nonlinear coherent neutrino self-interactions. In the absence of incoherent collisional effects, we observe a dependence of this instability growth rate on the neutrino mass spectrum: the normal neutrino mass hierarchy exhibits spatial instability over a larger range of neutrino number density compared to that of the inverted case. We further consider the effect of elastic incoherent collisions of the neutrinos with a static background of heavy, nucleon-like scatterers. At small scales, the growth of flavor instability can be suppressed by collisions. At large length scales we find, perhaps surprisingly, that for inverted neutrino mass hierarchy incoherent collisions fail to suppress flavor instabilities, independent of the coupling strength.

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